基于支路影响系数分析的接地网分层故障诊断方法研究

Hierarchical Fault Diagnosis Method of Grounding Grid Based on Branches’ Influence Coefficient

现有的基于电磁感应理论的接地网故障诊断方法需要大量的磁场测量数据,为了解决该问题,笔者提出了一种基于支路影响系数分析的分层诊断方法。首先定义了支路影响系数,并根据影响系数建立了支路诊断难易程度的评价体系。在该评价体系的指导下,分层诊断方法的测量点选取更具针对性,并以分层递进的方式实现了高精确度的腐蚀诊断。在诊断模型求解方面,运用改进的鲸鱼优化算法,保证了分层诊断的准确性。最后,进行了分层诊断与普通磁场反演诊断的对比实验。实验结果表明:分层诊断方法可以在保证诊断准确率的情况下大幅减少测量点数量(可做到接地网支路数50%以下),并且能够缩小测量点的分布范围,因此该方法可以减少现场测量工作量,提高接地网故障诊断效率。

The grounding grid fault diagnosis based on the magnetic field method needs a large amount of measurement data. In order to solve this problem,a hierarchical fault diagnosis method based on branches’ influence coefficient is proposed. Firstly,the author defines the influence coefficient of the branch,and establishes the evaluation system for the difficult degree of diagnosis. Under the guidance of the evaluation system,the selection of measurement points is more pertinent and the high accuracy diagnosis of corrosion is realized by the hierarchical progressive mode. Finally,a comparative experiment is conducted between the hierarchical diagnosis and the common magnetic field inversion diagnosis. The results show that the hierarchical diagnosis method can greatly reduce the number of measuring points( less than50% of the number of grounding network branches) and reduce the distribution range of measuring points,while ensuring the diagnosis accuracy. Therefore,the hierarchical method can reduce the amount of on-site measurement and improve the efficiency of fault diagnosis.